fix: resolve all fmt and clippy warnings

Main lib (src/):
- Add #[allow(dead_code)] for build_info field (stored to prevent Prometheus unregistration)
- Add #[allow(dead_code)] for first_seen field (reserved for future rate limiting)
- Replace .or_insert_with(RelaySyncNeeds::default) with .or_default()
- Replace manual div_ceil implementations with .div_ceil(100)

Test code (tests/):
- Replace .expect(&format!(...)) with .unwrap_or_else(|_| panic!(...))
- Remove needless borrows in fetch_metrics() calls
- Add #[allow(dead_code)] and #[allow(unused_imports)] to test helpers module

grasp-audit:
- Apply cargo fmt to fix formatting

1 files changed, 1 insertions, 2 deletions

diff --git a/src/nostr/policy/mod.rs b/src/nostr/policy/mod.rs
index 6d67394..19db5f6 100644
--- a/src/nostr/policy/mod.rs
+++ b/src/nostr/policy/mod.rs
@@ -5,7 +5,6 @@
 /// - `StatePolicy` - State event validation + ref alignment
 /// - `PrEventPolicy` - PR/PR Update validation
 /// - `RelatedEventPolicy` - Forward/backward reference checking
-
 mod announcement;
 mod pr_event;
 mod related;
@@ -38,4 +37,4 @@ impl PolicyContext {
             git_data_path: git_data_path.into(),
         }
     }
-}
\ No newline at end of file
+}